All healers have been great at healing, so that is hardly something that’s attractive. Holy is only great in casual content, and not something that is attractive. The problem people have had with whm is it does not bring anything to the table that’s better than the other healers that really matters in high end content. What’s the point in great heals when the others are just as capable as whm? And what’s the point in having great heals when the content doesn’t require it? Sch and Ast have been the power couple because of their raid utility. Whm was being locked out of parties because they lacked anything that made it compete with the other two.
Casual content isn’t the worry here. It’s how a job performs and competes in high end content. Whms want to be competitive with the other healers. Good heals and holy do not cut it, because like it or not, everything revolves around damage. If you can’t increase the damage your team does, then you need to make up for it in personal dps (see blm and sam as examples). Our heals aren’t what makes a certain job desirable when the others are just as capable at healing. Our worth is in our damage/raid contribution, so I would not say whms are eating their cake.
Whms don’t want to get put on a shelf once progression is done. Again. And it’s gonna keep happening if they don’t have any meaningful advantages over the other two.